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Got a question/problem. I've noticed that both in a fully upgraded career mode & in sandbox mode, all reactors power output are stuck at mk3, rather than upgrading through mk4 to 5. What is the cause of this and how may I fix it?

"The reason he Gascore reactor doesn't perform well is because it's internal vortex collapses due to Kerbin gravity. It can only operate well under low acceleration/gravity conditions." I never knew that! Glad to see I am still learning new quirks in this mod. Thanks FT and SciMan.

I am running into an odd problem with the gas core reactor on my spaceplane using a thermal turbojet. I noticed I was getting very little thrust and was running out of thermal power very quickly, I found what could be the cause, the reactor was only operating at 10%. So I’ve ran a few more tests (see picture), using most of the reactor types at 2.5m. I found that only the dumbo and normal molten salt reactors would operate at 100%, the rest never reached that level. Even stranger, the gas core and molten salt rector varied in power output, oscillated from 10-12%. I’ve used kspi for over a year but can’t figure out what could cause a reactor to stay at 10%. Also, the normal salt reactor produced more thermal power at 2.5m than the large salt reactor. Possible glitch? Another point, I noticed different isp results from different thermal turbojets depending on the reactor, all using air as propellant. How might this effect a spaceplane or other craft? On a final note, this is my first forum post, so I just like to say thank you Freethinker for maintaining this amazing mod, I’ve used it for a very long time and find it adds so much to the KSP experience. People like you add so much to video games.